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Assertion : A safe turn by a cyclist s...

Assertion : A safe turn by a cyclist should neither be fast nor sharp.
Reason : The bending angle from the vertical would decrease with increase in velocity.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

Text Solution

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The correct Answer is:
C
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Assertion : The tendency of skidding or overturning is quadrupled, when a cyclist doubles his speed of turning. Reason : Angle of bending measured from ground., decreases as velocity of vehicle increases.

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Asseration : A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a ceratin distance. The surface is now tilted to an angle of 30^@ with the horizontal and same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is small than the first situation. Reason : The coefficient of friction between the block and the surface decreases with the increase in the angle of inclination.

These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c ) If Assertion is true but Reason is false. (d) If Assertion is false but Reason is true. Assertion A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a certain distance. The surface is now tilted to an angle of 30^(@) with the horizontal and the same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is smaller than that in the first situation. Reason The coefficient of friction between the block and the surface decreases with the increase in the anglle of inclination.

Assertion (A) : Rate of reaction will be doubled, when temperature increased from 298 k to 308 k. Reason (R ): The activation energy of reaction decreases with increase in temperature.

Assertion : The angle of contact of a lilquid with a solid decreases with increase in temperature. Reason : With increase in temperature, the surface tension of the liquid increases.

In the following questions a statement of assertion (A) is followed by a statement of reason ( R). A: When a body moves on a curved path with increasing speed then angle between instantaneous velocity and acceleration is acute angle. R: When the speed is increasing its tangential acceleration is in the direction of instaneous velocity .

Assertion : As the frictional force increases, the safe velocity limit for taking a turn on an unbanked road also increases. Reason : Banking of roads will increase the value of limiting velocity.

ERRORLESS -MOTION IN TWO DIMENSION-Exercise
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  2. Assertion : When an automobile while going too fast around a curve o...

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  3. Assertion : A safe turn by a cyclist should neither be fast nor shar...

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  4. Assertion : Improper banking of roads causes wear and tear of tyres....

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  5. Assertion : Cream gets separated out of milk when it is churned, it ...

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  6. Assertion : Two similar trains are moving along the equatorial line ...

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  7. Assertion : A coin is placed on phonogram turn table. The motor is sta...

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  8. Roads are banked on curves so that

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  9. In uniform circular motion

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  10. For a body moving in a circular path, a condition for no skidding if m...

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  11. A car is moving with a uniform speed on a level road. Inside the car t...

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  12. A particle is moving on a circular path of radius r with uniform veloc...

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  13. A body is revolving with a uniform speed v in a circle of radiusr . Th...

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  14. A particle does uniform circular motion in a horizontal plane. The ra...

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  15. A body of mass m is suspended from a string of length l . What is mini...

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  16. A particle moves with constant angular velocity in circular path of ce...

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  17. In the above question, if the angular velocity is kept same but the ra...

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  18. In above question, if the centripetal force F is kept constant but the...

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  19. A small body of mass m slides without friction from the top of a hemi...

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  20. A body is mass m is rotating in a vertical circle of radius 'r' with c...

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